[k3ng] built his own automatic antenna tuner. First, it measures the SWR of the line by using a tandem match coupler. This device allows the forward and reflected signals on the line to be extracted.

A plug-in card or USB module for a computer that tunes in over-the-air (OTA) or cable TV channels. Attaching to the antenna cable or the cable company's cable via a coaxial F connector, the tuner ...

Now with a cheap USB TV tuner card, you can jump right into the world of software-defined radio. Elsewhere on the Internet, a surprisingly active RTL-SDR subreddit popped up dedicated to using ...